fr.ifremer.isisfish.logging.io

Class MemoryOffsetReader

java.lang.Object

fr.ifremer.isisfish.logging.io.OffsetReader

fr.ifremer.isisfish.logging.io.MemoryOffsetReader

public class MemoryOffsetReader
extends OffsetReader

This class is a Offset Reader using a memory cache.

All offsets are saved in memory.

Author:

chemit

Field Summary

Fields

Modifier and Type	Field and Description
protected int	capacity capacity of cache
protected static org.apache.commons.logging.Log	log
protected Map<Long,Long>	offsetCache cache of offsets

Fields inherited from class fr.ifremer.isisfish.logging.io.OffsetReader

nbLines

Constructor Summary

Constructors

Constructor and Description
MemoryOffsetReader(int capacity)

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close the reader
long	getOffset(long position) Obtain an offset for a position
protected boolean	needCreate()
protected void	storeOffset(long position, long offset) Save the offset of the line for a given position
String	toString()

Methods inherited from class fr.ifremer.isisfish.logging.io.OffsetReader

createOffsets, createOffsets, createOffsetsForLog, deleteOffsetFile, getNbLines, isLogEntry, open, readLine, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

log

protected static final org.apache.commons.logging.Log log

offsetCache

protected Map<Long,Long> offsetCache

cache of offsets

capacity

protected int capacity

capacity of cache

Constructor Detail

MemoryOffsetReader

public MemoryOffsetReader(int capacity)

Method Detail

close

public void close()
           throws IOException

Description copied from class: OffsetReader

Close the reader

Overrides:

close in class OffsetReader

Throws:

IOException - if any problem while closing

getOffset

public long getOffset(long position)

Description copied from class: OffsetReader

Obtain an offset for a position

Specified by:

getOffset in class OffsetReader

Parameters:

position - position of the line

Returns:

the offset of the first car of the given line

storeOffset

protected void storeOffset(long position,
               long offset)

Description copied from class: OffsetReader

Save the offset of the line for a given position

Specified by:

storeOffset in class OffsetReader

Parameters:

position - current line position

offset - current offset of line

needCreate

protected boolean needCreate()

Specified by:

needCreate in class OffsetReader

Returns:

true if the reader need to create his internal datas.

toString

public String toString()

Overrides:

toString in class Object